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/*
* ================================================================================
* Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*
*/
package org.onap.dcae.analytics.model.util.function;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.Optional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Converts given Json String to Java Object if possible
*
* @param <T> Target Java Object class Type for JSON String
*
* @author Rajiv Singla
*/
public class JsonToJavaObjectBiFunction<T> implements BiFunctionExtension<TypeReference<T>, String, Optional<T>> {
private static final Logger logger = LoggerFactory.getLogger(JsonToJavaObjectBiFunction.class);
private final ObjectMapper objectMapper;
public JsonToJavaObjectBiFunction(final ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
@Override
public Optional<T> apply(final TypeReference<T> typeReference, final String jsonString) {
try {
return Optional.of(objectMapper.readValue(jsonString, typeReference));
} catch (IOException e) {
logger.error("Unable to convert given JSON String to Java Object. JSON String: " + jsonString, e);
}
return Optional.empty();
}
}
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